Abstract
In order to clarify the degree of localization of the impurity state, electrical resistivities of dilute chromium alloys with Mn, Fe and Co were measured from 1.2°K above to their transition temperatures. The resistivity due to the potential scattering by the impurity atom was separated empirically and it was found that the resistivity due to impurity scattering of Mn alloy is at most 0.8 µ\(\varOmega\) cm per 1 at. % of Mn and is extremely small compared with those of Fe and Co. This supports the view that the impurity state of Mn in Cr is not localized, while those of Fe and Co are considerablly localized. No resistance minimum was observed in these alloys and even in very dilute alloys within the experimental errors.
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